No I can't since all this is under NDA.
What you is say is true only for their own Microsoft store, so if the game is released there it will have a full crossplay between Xbox and PC version, regardless what you play on (like in Halo, Forza etc). They cant' control/couldn't care less about third-party platforms like our PC launcher and store and have strict regulations about them.
This is a common misconception, but you don't become a "new PC player" once you link the email. You still have an Xbox account that has restrictions applied to it when it comes to what you can purchase in third-party stores / what features are available etc. The fact that at least you can buy GE in our store and have a shared balance with GE that you bought in Microsoft store is already a huge improvement, it wasn't always the case.